English verb conjugation
SHOULD GRADE

Regular verb: grade - graded - graded

Affirmation

Simple form	V-ing form
I'd grade you'd grade he'd grade we'd grade you'd grade they'd grade	I'd be grading you'd be grading he'd be grading we'd be grading you'd be grading they'd be grading
Perfect	V-ing perfect
I should've graded you should've graded he should've graded we should've graded you should've graded they should've graded	I should've been grading you should've been grading he should've been grading we should've been grading you should've been grading they should've been grading

Negation

Simple form	V-ing form
I shouldn't grade you shouldn't grade he shouldn't grade we shouldn't grade you shouldn't grade they shouldn't grade	I shouldn't be grading you shouldn't be grading he shouldn't be grading we shouldn't be grading you shouldn't be grading they shouldn't be grading
Perfect	V-ing perfect
I shouldn't have graded you shouldn't have graded he shouldn't have graded we shouldn't have graded you shouldn't have graded they shouldn't have graded	I shouldn't have been grading you shouldn't have been grading he shouldn't have been grading we shouldn't have been grading you shouldn't have been grading they shouldn't have been grading

Interrogative form

Simple form	V-ing form
should I grade? should you grade? should he grade? should we grade? should you grade? should they grade?	should I be grading? should you be grading? should he be grading? should we be grading? should you be grading? should they be grading?
Perfect	V-ing perfect
should I have graded? should you have graded? should he have graded? should we have graded? should you have graded? should they have graded?	should I have been grading? should you have been grading? should he have been grading? should we have been grading? should you have been grading? should they have been grading?

Interro-negative form

Simple form	V-ing form
shouldn't I grade? shouldn't you grade? shouldn't he grade? shouldn't we grade? shouldn't you grade? shouldn't they grade?	shouldn't I be grading? shouldn't you be grading? shouldn't he be grading? shouldn't we be grading? shouldn't you be grading? shouldn't they be grading?
Perfect	V-ing perfect
shouldn't I have graded? shouldn't you have graded? shouldn't he have graded? shouldn't we have graded? shouldn't you have graded? shouldn't they have graded?	shouldn't I have been grading? shouldn't you have been grading? shouldn't he have been grading? shouldn't we have been grading? shouldn't you have been grading? shouldn't they have been grading?